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中文摘要：
运用能值分析理论和方法,选取1998-2008年的农业原始数据,对延安市农业生态系统的投入产出结构和能值指标进行了分析。结果表明：（1）延安农业生态系统能值投入以可更新和不可更新能值为主;期间能值投入整体呈上升趋势,特别是工业辅助能的增加最为显著;能值产出结构以种植业和畜牧业为主,林业和渔业所占比重较低。（2）可更新能值比较高,环境负载率较低,但呈上升趋势,表明区域环境压力增大。（3）能值投入率、人均能值利用量和人均工业辅助能都在上升,而净能值产出率和能值货币比值则在减少,整体经济发展水平较低,但随着西部大开发战略的实施以及经济技术的进步,经济发展速度较快。（4）农业生产优势度指数较低,产业优势不明显;系统稳定度指数较高,自稳定性强;农业可持续发展能值指数大幅度降低,可持续发展能力增强;表明延安市农业生态系统的发展变化趋势是高效、稳定和可持续的。
英文摘要：
The paper analyzed the input-output structure and emergy indexes of the agri-ecological system in Yan＇an city by using the theory and method of emergy analysis.Such conclusions were reached：（1） The majority of emergy input is renewable emergy,and the overall emergy input shows ascendant trend;emergy output mainly includes crop cultivation and stock raising,but forestry and fish culture takes low percentage.（2） Renewable emergy ratio is high,but environment load rate is low,so the regional environment endures increasing pressure.（3） Emergy input rate and emergy utilizing rate are rising,on the contrary,emergy output rate and emergy currency ratio are reducing.Overall economic development level is low,but with the implementation of the western development and economic and technological progress,economic development speed is improving.（4） Dominance index of agricultural production is low,and system production advantage is not obvious;the system has high stability index,and the self-stability is strong;Agricultural sustainable development emergy index has greatly reduced,and sustainable development ability is enhanced.
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